Korduvtäitmise

Korduvtäitmise, often translated as "repeated filling" or "recharge," is a process primarily discussed in the context of nuclear reactor technology and the management of spent nuclear fuel. It refers to the practice of refilling a nuclear reactor core with fresh nuclear fuel while the reactor is still operating, or during short shutdown periods. This contrasts with the more common approach of completely removing all spent fuel and replacing it with fresh fuel during a scheduled outage.

The primary motivation behind korduvtäitmise is to optimize fuel utilization and increase the operational efficiency of a reactor. By strategically replacing only a portion of the fuel elements, operators can maintain a more consistent power output and extend the reactor's operational cycle. This method allows for the removal of the most depleted fuel assemblies and their replacement with fresh ones, ensuring that the core remains critical for longer periods.

However, korduvtäitmise presents significant technical challenges. It requires sophisticated refueling machinery capable of operating in a radioactive environment and performing precise manipulations within the reactor core. Safety considerations are paramount, as refueling operations, even partial ones, must be conducted with extreme caution to prevent accidents. The complexity and specialized equipment needed for korduvtäitmise mean that it is not a universally adopted refueling strategy. It is more common in certain types of reactors, particularly those designed with specific refueling mechanisms that facilitate on-power or short-cycle refueling. The decision to implement korduvtäitmise is typically based on economic, operational, and safety analyses specific to each reactor and its operating utility.